rule win_starcruft_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.starcruft."
        info = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.6.0"
        signator_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.starcruft"
        malpedia_rule_date = "20260916"
        malpedia_hash = "53a643781c18e08f4a50949af60172d837a0b6f6"
        malpedia_version = "20260917"
        malpedia_license = "CC BY-SA 4.0"
        malpedia_sharing = "TLP:WHITE"

    /* DISCLAIMER
     * The strings used in this rule have been automatically selected from the
     * disassembly of memory dumps and unpacked files, using YARA-Signator.
     * The code and documentation is published here:
     * https://github.com/fxb-cocacoding/yara-signator
     * As Malpedia is used as data source, please note that for a given
     * number of families, only single samples are documented.
     * This likely impacts the degree of generalization these rules will offer.
     * Take the described generation method also into consideration when you
     * apply the rules in your use cases and assign them confidence levels.
     */


    strings:
        $sequence_0 = { 50 ff15???????? 837de400 740c e8???????? 33c0 e9???????? }
            // n = 7, score = 100
            //   50                   | push                eax
            //   ff15????????         |                     
            //   837de400             | cmp                 dword ptr [ebp - 0x1c], 0
            //   740c                 | je                  0xe
            //   e8????????           |                     
            //   33c0                 | xor                 eax, eax
            //   e9????????           |                     

        $sequence_1 = { 6a02 6a00 6a00 68000000c0 8d8db8f2ffff 51 }
            // n = 6, score = 100
            //   6a02                 | push                2
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   68000000c0           | push                0xc0000000
            //   8d8db8f2ffff         | lea                 ecx, [ebp - 0xd48]
            //   51                   | push                ecx

        $sequence_2 = { 50 8b4d08 51 ff15???????? 8945fc 8b5508 52 }
            // n = 7, score = 100
            //   50                   | push                eax
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   51                   | push                ecx
            //   ff15????????         |                     
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   8b5508               | mov                 edx, dword ptr [ebp + 8]
            //   52                   | push                edx

        $sequence_3 = { 83c404 8b55fc 0fb74202 83f821 7532 68???????? 8b4dfc }
            // n = 7, score = 100
            //   83c404               | add                 esp, 4
            //   8b55fc               | mov                 edx, dword ptr [ebp - 4]
            //   0fb74202             | movzx               eax, word ptr [edx + 2]
            //   83f821               | cmp                 eax, 0x21
            //   7532                 | jne                 0x34
            //   68????????           |                     
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]

        $sequence_4 = { 55 8bec 8b4508 c7003c000000 8b4d08 8b550c }
            // n = 6, score = 100
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   c7003c000000         | mov                 dword ptr [eax], 0x3c
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   8b550c               | mov                 edx, dword ptr [ebp + 0xc]

        $sequence_5 = { 837de400 7516 837df800 7510 837de800 750a 837dfc00 }
            // n = 7, score = 100
            //   837de400             | cmp                 dword ptr [ebp - 0x1c], 0
            //   7516                 | jne                 0x18
            //   837df800             | cmp                 dword ptr [ebp - 8], 0
            //   7510                 | jne                 0x12
            //   837de800             | cmp                 dword ptr [ebp - 0x18], 0
            //   750a                 | jne                 0xc
            //   837dfc00             | cmp                 dword ptr [ebp - 4], 0

        $sequence_6 = { 51 8b95a4fcffff 52 68???????? 6807020000 8d85e0fcffff 50 }
            // n = 7, score = 100
            //   51                   | push                ecx
            //   8b95a4fcffff         | mov                 edx, dword ptr [ebp - 0x35c]
            //   52                   | push                edx
            //   68????????           |                     
            //   6807020000           | push                0x207
            //   8d85e0fcffff         | lea                 eax, [ebp - 0x320]
            //   50                   | push                eax

        $sequence_7 = { 0bc8 8b550c 0fb64203 c1e018 0bc8 894db0 }
            // n = 6, score = 100
            //   0bc8                 | or                  ecx, eax
            //   8b550c               | mov                 edx, dword ptr [ebp + 0xc]
            //   0fb64203             | movzx               eax, byte ptr [edx + 3]
            //   c1e018               | shl                 eax, 0x18
            //   0bc8                 | or                  ecx, eax
            //   894db0               | mov                 dword ptr [ebp - 0x50], ecx

        $sequence_8 = { 85c9 750d 6810270000 ff15???????? ebe7 eb26 }
            // n = 6, score = 100
            //   85c9                 | test                ecx, ecx
            //   750d                 | jne                 0xf
            //   6810270000           | push                0x2710
            //   ff15????????         |                     
            //   ebe7                 | jmp                 0xffffffe9
            //   eb26                 | jmp                 0x28

        $sequence_9 = { c645a46c c645a560 c645a659 8d4dac 51 }
            // n = 5, score = 100
            //   c645a46c             | mov                 byte ptr [ebp - 0x5c], 0x6c
            //   c645a560             | mov                 byte ptr [ebp - 0x5b], 0x60
            //   c645a659             | mov                 byte ptr [ebp - 0x5a], 0x59
            //   8d4dac               | lea                 ecx, [ebp - 0x54]
            //   51                   | push                ecx

    condition:
        7 of them and filesize < 294912
}